I just added a big gun exhaust to my daughters '03 xr 100 and it sounds great. However the bike was popping slightly on decel. I tried to raise the needle and it didn't solve the popping. I went up 1 size on the pilot and the popping has gone away and it still runs good, but I no longer need the choke to start the bike. Would it be better to have a mild popping on decel (lean) or deal with the no choke situation (rich).